Have you heard about constraint type 'O'

I was browsing through Oracle 11i applsys schema and i found there is
a constraint type called O . I saw all the constraint belongs to this
type for AQ tables.  I do not see any oracle  documentation for this
type. Any body know what for this used?.
-- 
Thiru Pandian 
Sr. Oracle DBA
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http://www.freelists.org/webpage/oracle-l

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